The phrase "well-sorted rock" is not a standard geological term. It's likely someone is using it in a casual way, but it could mean a few things:

1. A Rock with Uniform Grain Size:

* This is the most likely meaning. In geology, "sorting" refers to the uniformity of grain sizes within a rock or sediment. A "well-sorted" rock would have grains that are all roughly the same size, like sand on a beach.

2. A Rock with Clearly Defined Minerals:

* This could also be implied, though it's less common. A "well-sorted" rock might mean one where the different minerals within it are easily distinguishable and arranged in a visually pleasing way.

3. A Rock with a Specific, Desired Sorting:

* If the person using the term is talking about something specific, like a rock for landscaping, "well-sorted" could refer to a rock with a specific grain size or shape that's desired for the project.

To understand the meaning, you need context:

* Who is using the term? Are they a geologist, a landscaper, or someone else?

* What is the context? Are they talking about a specific rock, a type of rock, or a general concept?

Let me know if you can provide more context, and I can help you understand what they mean!